摘要：4．对数的性质(M>0, N>0), 1)ax=Mx=log­aM(a>0, a1), 2)log­a­(MN)= log­a M+ log­a N, 3)log­a()= log­a M- log­a N,4)log­a Mn=n log­a M,. 5)log­a =log­a M,6)alog­a M=M; 7) log­a b=(a,b,c>0, a, c1).

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